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Cross-gradients joint 3D inversion with applications to gravity and magnetic data
GEOPHYSICS, 2009We extend the cross-gradient methodology for joint inversion to three-dimensional environments and introduce a solution procedure based on a statistical formulation and equality constraints for structural similarity resemblance. We apply the proposed solution to the joint 3D inversion of gravity and magnetic data and gauge the advantages of this new ...
Emilia Fregoso, Luis A. Gallardo
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Cross-gradients Joint Inversion of Time-lapse Crosshole ERT and GPR Data
Near Surface 2010 - 16th EAGE European Meeting of Environmental and Engineering Geophysics, 2010Time-lapse geophysical monitoring is a valuable tool in hydrogeology, but the resulting models can suffer from inversion ambiguities. These ambiguities may be reduced by structural joint inversion of multiple geophysical methods. Joint inversion using cross-gradients constraints has been successfully applied to static geophysical measurements.
J.A. Doetsch, N. Linde, A. Binley
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Deep network based geosteering inversion with cross-gradients
First International Meeting for Applied Geoscience & Energy Expanded Abstracts, 2021Yuchen Jin, Weichang Li
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Proceedings, 2017
Solving joint inverse problems requires appropriate regularisation and coupling operators. In particular, when the inversion is performed on irregular meshes where cell sizes vary throughout the domain, the operators should be designed to be as independent of the discretisation as possible. We define regularisation operators for inversions on irregular
C. Jordi +4 more
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Solving joint inverse problems requires appropriate regularisation and coupling operators. In particular, when the inversion is performed on irregular meshes where cell sizes vary throughout the domain, the operators should be designed to be as independent of the discretisation as possible. We define regularisation operators for inversions on irregular
C. Jordi +4 more
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2D joint inversion of CSAMT and magnetic data based on cross-gradient theory
Applied Geophysics, 2017A two-dimensional forward and backward algorithm for the controlled-source audio-frequency magnetotelluric (CSAMT) method is developed to invert data in the entire region (near, transition, and far) and deal with the effects of artificial sources. First, a regularization factor is introduced in the 2D magnetic inversion, and the magnetic susceptibility
Kun-Peng Wang, Han-Dong Tan, Tao Wang
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2D data-space cross-gradient joint inversion of MT, gravity and magnetic data
Journal of Applied Geophysics, 2017Abstract We have developed a data-space multiple cross-gradient joint inversion algorithm, and validated it through synthetic tests and applied it to magnetotelluric (MT), gravity and magnetic datasets acquired along a 95 km profile in Benxi-Ji'an area of northeastern China.
Yong-Chol Pak, Tonglin Li, Gang-Sop Kim
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Microbial Ecology, 2002
A laboratory experiment was performed to test whether differences in nutrient and energy demands between picophytoplankton and heterotrophic bacteria can explain the apparent inverse biomass relationship between these organisms in lakes along gradients of organic carbon and nutrients.
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A laboratory experiment was performed to test whether differences in nutrient and energy demands between picophytoplankton and heterotrophic bacteria can explain the apparent inverse biomass relationship between these organisms in lakes along gradients of organic carbon and nutrients.
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Ecological Limits and Fitness Consequences of Cross‐Gradient Pollen Movement in Lasthenia fremontii
The American Naturalist, 2009The interaction between gene flow and environmental heterogeneity plays a key role in shaping the distribution patterns that we observe in natural populations. Although a growing body of theoretical work is exploring the effects of gene flow on the evolution of range limits and ecological specialization, explicit empirical tests of model assumptions ...
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Cross-Gradient Joint 3D Inversion of Geophysical Data with Applications to Gravity and Magnetics
EGM 2007 International Workshop, 2007We extend the cross-gradients philosophy for joint inversion to three-dimensional environments and developed a solution procedure based on a statistical formulation and singular value decomposition. We apply the proposed solution to the joint 3D inversion of gravity and magnetic data where we gauge the advantages of this new formulation on comparative ...
E. Fregoso-Becerra, L. A. Gallardo
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AVA inversion of pre-stack seismic data with cross-gradient constraints
Journal of Applied Geophysics, 2022Ronghuo Dai, Cheng Yin, Da Peng
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